The dinuclear title complex, [Ag2(C6H7N2S)2(C18H15P)2], comprises two inversion-related [Ag(C6H7N2S)(C18H15P)] units. The pyrimidinethiolate anion acts both as a bridging and a chelating ligand. The AgI ions are linked via two 2-S donor atoms, which generate a strictly planar Ag2S2 core with an AgAg separation of 2.9569 (4) Å. The AgI ion presents a distorted tetrahedral coordination geometry. In the crystal, weak C-HN and C-HS hydrogen bonds link the complex molecules into a two-dimensional network parallel to (010).

In recent years, a large number of structural reports on metal(I) complexes
containing heterocyclic thiones as ligands or mixed-ligands with
triphenylphosphane have been studied (Aslanidis et al., 1997;
McFarlane
et al., 1998; Pakawatchai et al., 2012; Nimthong
et al.,
2012) because of not only their potential applications due to their
antimicrobial activities (Nawaz et al., 2011), but also strongly
luminescent properties (Hameau et al., 2012).

The structure of the title dinuclear mixed-ligand complex displays the
distorted tetrahedral coordination of each AgI center, which exhibits a
planar Ag2S2 moiety in which each of the doubly S-bridged AgI centers is
surrounded by the one P atom of phosphane ligand and one N atom of the dmpymtH
ligands (Fig. 1). The Ag—Ag distance of 2.9569 (4) Å in the four-membered
Ag2S2 ring is shorter than in [Ag2X2(l-S-pySH)2(PPh3)2]
(X = Cl and Br), 3.8425 (8) and 3.8211 (4) Å, respectively (Lobana
et al., 2008) and also shorter than the sum of the covalent
radii of
two AgI centers (3.44 Å). Focusing on the comparison of bond distances and
bond angles around the AgI ion, the Ag—S bond lengths [2.5492 (6)–2.7897
(6) Å] are in good agreement with values reported for other silver(I)
complexes with heterocyclic thione ligands, such as 2.5548 (9) Å for
[Ag(PPh3)(pymtH)Br]2 (Cox et al., 2000) and 2.537 (2) Å for
[Ag(Ph3P)(Diaz)2]2(NO3)2 (Nawaz et al., 2011). The
Ag1—P1
bond length of 2.4088 (6) Å is similar to that found in
[Ag(PPh3)(thiourea)(NO3)]2.[Ag(PPh3)(thiourea)]2(NO3)2
[2.4029 (10)–2.4157 (10) Å] (Isab et al., 2010). The two
S1–Ag1–P1
angles of 116.81 (2) and 123.56 (2)° are larger than the normal tetrahedral
value of 109.5°. In the crystal, the intermolecular interactions
C14(sp2)—H14···N2 [H14···N2 = 2.686 (4) Å, C14(sp2)···N2
= 3.471 (4) Å and C14(sp2)—H14···N2 = 142.52 (8)°] and
C14(sp2)—H14···S1 [H14···S1 = 2.942 (3) Å, C14(sp2)···S1
= 3.801 (3) Å and C14(sp2)—H14···S1 = 154.18 (9)°] form chains
(Fig. 2). Moreover, secondary interactions C35(sp2)—H35···N2
[H35···N2 = 2.928 (4) Å, C35(sp2)···N2 = 3.756 (4) Å and
C35(sp2)—H35···N2 = 150.48 (7)°] are also observed, which form the
two-dimensional layer network (Fig. 3).

Triphenylphosphane (0.31 g, 1.18 mmol) was dissolved in 30 cm3 of ethanol at
335 K. Silver acetate (0.10 g, 0.60 mmol) was added and the mixture was
stirred for 3 h. 4,6-Dimethylpyrimidine-2(1H)-thione (0.18 g, 0.46 mmol) was added and the new reaction mixture was refluxed for 2 h where upon
the precipitate gradually disappeared. The resulting clear solution was
filtered off and left to evaporate at room temperature. The crystalline solid,
which was deposited upon standing for several days, was filtered off and dried
under reduced pressure.

The H atoms bonded to C atoms were constrained to ride on their parent atoms
with C—H bond lengths of 0.93 Å [aryl CH, Uiso(H) =
1.2Ueq(C)] and 0.96 Å [methyl CH3, Uiso(H) =
1.5Ueq(C)] except for H3, which was located in a difference map and
refined isotropically.